[MaciekA]

I disagree with a lot of the advice above, especially the "buy a VFC" comment, given your budget of $150.

Firstly, this is a fine gun to do upgrades to, and you can get pretty far with $150. I have my JG significantly upgraded with fat new wiring, a stronger spring, a better motor, and it works great.

Secondly, if you have the 8mm gearbox version, there's absolutely no reason why you can't make this thing a beast.

As for the upgrades, do them in this order:

1) If you have plastic or nylon bushings, you will need to upgrade them to metal ones. This upgrade will be no more than 10-20 bucks.

2) Upgrade your wiring and switch your battery connectors to Deans. (Skip the MOSFET for now. You can get this gun to fire much faster with only 7.4V LiPos and you can leave the advanced MOSFET stuff till later.)

3) Install a G&P M120 short-type motor. Reshim your gears (get the Advanced shim set for $4 or whatever from Airsoftparts.ca) until they and the motor sound reasonably quiet and don't make a crazy whining noise.

That's pretty much it. I have a Modify S110+ spring in mine and it fires 17rps at 400fps, so if you want higher RoF than that you can easily get it quite a bit higher just by popping in a lighter spring.